Secret compartment hollow screw trick puzzle

Top screw is links threaded which makes it counter intuitive as intended. Walls are 2mm. Threads are M12x1.75

Original is made by robrook https://www.thingiverse.com/thing:330688 but there were some problems with scaling in the slicer, and some minor problems with the secret screw threads showing when screwed in.

I also included an exported step-file from fusion 360